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matlab.ui.componentcontainer.ComponentContainer class

Package: matlab.ui.componentcontainer

Base class for developing UI component objects

Description

matlab.ui.componentcontainer.ComponentContainer is a class you build on to make your own classes of UI Component objects. When you define a subclass of this base class, you can use the ComponentContainer properties and methods to build your UI component objects. Specify this syntax on the first line of your class definition file to directly inherit from the ComponentContainer class, where MyComponent is the name of your object:

classdef MyComponent < matlab.ui.componentcontainer.ComponentContainer

The matlab.ui.componentcontainer.ComponentContainer class is a handle class.

Class Attributes

Abstract
true
HandleCompatible
true

For information on class attributes, see Class Attributes.

Properties

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Color and Styling

Background color, specified as an RGB triplet, a hexadecimal color code, or one of the color options listed in the table.

RGB triplets and hexadecimal color codes are useful for specifying custom colors.

  • An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range [0,1]; for example, [0.4 0.6 0.7].

  • A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (#) followed by three or six hexadecimal digits, which can range from 0 to F. The values are not case sensitive. Thus, the color codes '#FF8800', '#ff8800', '#F80', and '#f80' are equivalent.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Color NameShort NameRGB TripletHexadecimal Color CodeAppearance
'red''r'[1 0 0]'#FF0000'

'green''g'[0 1 0]'#00FF00'

'blue''b'[0 0 1]'#0000FF'

'cyan' 'c'[0 1 1]'#00FFFF'

'magenta''m'[1 0 1]'#FF00FF'

'yellow''y'[1 1 0]'#FFFF00'

'black''k'[0 0 0]'#000000'

'white''w'[1 1 1]'#FFFFFF'

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB® uses in many types of plots.

RGB TripletHexadecimal Color CodeAppearance
[0 0.4470 0.7410]'#0072BD'

[0.8500 0.3250 0.0980]'#D95319'

[0.9290 0.6940 0.1250]'#EDB120'

[0.4940 0.1840 0.5560]'#7E2F8E'

[0.4660 0.6740 0.1880]'#77AC30'

[0.3010 0.7450 0.9330]'#4DBEEE'

[0.6350 0.0780 0.1840]'#A2142F'

Attributes:

GetAccess
public
SetAccess
public
Dependent
true
GetObservable
true
SetObservable
true
Interactivity

State of visibility, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

  • 'on' — Display the object.

  • 'off' — Hide the object without deleting it. You still can access the properties of an invisible UI component.

To make your app start faster, set the Visible property to 'off' for all components that do not need to appear at startup.

Changing the size of an invisible container triggers the SizeChangedFcn callback when it becomes visible.

Changing the Visible property of a container does not change the values of the Visible properties of child components. This is true even though hiding the container causes the child components to be hidden.

Attributes:

GetAccess
public
SetAccess
public
Dependent
true
GetObservable
true
SetObservable
true

Context menu, specified as a ContextMenu object created using the uicontextmenu function. Use this property to display a context menu when you right-click on a component.

Attributes:

GetAccess
public
SetAccess
public
NonCopyable
true
Transient
true
GetObservable
true
SetObservable
true
Position

UI component size and location, excluding the margins for decorations such as axis labels and tick marks. Specify this property as a vector of form [left bottom width height].

Note

Setting this property has no effect when the parent of the UI component is a GridLayout.

Attributes:

GetAccess
public
SetAccess
public
Dependent
true

Units of measurement, specified as 'pixels'.

Attributes:

GetAccess
public
SetAccess
public
Dependent
true
GetObservable
true
SetObservable
true

Layout options, specified as a GridLayoutOptions object. This property specifies options for components that are children of grid layout containers. If the component is not a child of a grid layout container (for example, it is a child of a figure or panel), then this property is empty and has no effect. However, if the component is a child of a grid layout container, you can place the component in the desired row and column of the grid by setting the Row and Column properties on the GridLayoutOptions object.

For example, this code places an image component in the third row and second column of its parent grid.

g = uigridlayout([4 3]);
im = uiimage(g);
im.ImageSource = 'peppers.png';
im.ScaleMethod = 'fill';
im.Layout.Row = 3;
im.Layout.Column = 2;

To make the image span multiple rows or columns, specify the Row or Column property as a two-element vector. For example, this image spans columns 2 through 3.

im.Layout.Column = [2 3];

Attributes:

GetAccess
public
SetAccess
public
Callback Execution Control

Callback interruption, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

This property determines if a running callback can be interrupted. There are two callback states to consider:

  • The running callback is the currently executing callback.

  • The interrupting callback is a callback that tries to interrupt the running callback.

Whenever MATLAB invokes a callback, that callback attempts to interrupt the running callback (if one exists). The Interruptible property of the object owning the running callback determines if interruption is allowed.

  • A value of 'on' allows other callbacks to interrupt the object's callbacks. The interruption occurs at the next point where MATLAB processes the queue, such as when there is a drawnow, figure, uifigure, getframe, waitfor, or pause command.

    • If the running callback contains one of those commands, then MATLAB stops the execution of the callback at that point and executes the interrupting callback. MATLAB resumes executing the running callback when the interrupting callback completes.

    • If the running callback does not contain one of those commands, then MATLAB finishes executing the callback without interruption.

  • A value of 'off' blocks all interruption attempts. The BusyAction property of the object owning the interrupting callback determines if the interrupting callback is discarded or put into a queue.

Note

Callback interruption and execution behave differently in these situations:

  • If the interrupting callback is a DeleteFcn, CloseRequestFcn or SizeChangedFcn callback, then the interruption occurs regardless of the Interruptible property value.

  • If the running callback is currently executing the waitfor function, then the interruption occurs regardless of the Interruptible property value.

  • Timer objects execute according to schedule regardless of the Interruptible property value.

When an interruption occurs, MATLAB does not save the state of properties or the display. For example, the object returned by the gca or gcf command might change when another callback executes.

Attributes:

GetAccess
public
SetAccess
public
GetObservable
true
SetObservable
true

Callback queuing, specified as 'queue' or 'cancel'. The BusyAction property determines how MATLAB handles the execution of interrupting callbacks. There are two callback states to consider:

  • The running callback is the currently executing callback.

  • The interrupting callback is a callback that tries to interrupt the running callback.

Whenever MATLAB invokes a callback, that callback attempts to interrupt a running callback. The Interruptible property of the object owning the running callback determines if interruption is permitted. If interruption is not permitted, then the BusyAction property of the object owning the interrupting callback determines if it is discarded or put in the queue. These are possible values of the BusyAction property:

  • 'queue' — Puts the interrupting callback in a queue to be processed after the running callback finishes execution.

  • 'cancel' — Does not execute the interrupting callback.

Attributes:

GetAccess
public
SetAccess
public
GetObservable
true
SetObservable
true

Deletion status, returned as an on/off logical value of type matlab.lang.OnOffSwitchState.

MATLAB sets the BeingDeleted property to 'on' when the DeleteFcn callback begins execution. The BeingDeleted property remains set to 'on' until the component object no longer exists.

Check the value of the BeingDeleted property to verify that the object is not about to be deleted before querying or modifying it.

Attributes:

GetAccess
public
SetAccess
protected
GetObservable
true
SetObservable
true
Parent/Child

Parent container of the component, specified as a Figure, Panel, Tab, or GridLayout object.

Attributes:

GetAccess
public
SetAccess
public
Transient
true
Dependent
true
NonCopyable
true
GetObservable
true
SetObservable
true

UI component children, returned as an empty GraphicsPlaceholder or a 1-D array of component objects. The children of a UI component object can be any UI component object.

You cannot add or remove child components using the Children property of the UI component. Use the Children property value to view the list of children or to reorder the children. The order of the children in the property value array reflects the front-to-back order (stacking order) of the components on the screen.

To add a child to this list, set the Parent property of the child component to the UI component.

Attributes:

GetAccess
public
SetAccess
public
Transient
true
Dependent
true
NonCopyable
true

Visibility of the component object handle in its parent's list of children, specified as one of these values:

  • 'on' — Component object handle is always visible.

  • 'off' — Component object handle is invisible at all times. This option is useful for preventing unintended changes to the components by another function. To temporarily hide the handle during the execution of that function, set the HandleVisibility to 'off'.

  • 'callback' — Component object handle is visible from within callbacks or functions invoked by callbacks, but not from within functions invoked from the command line. This option blocks access to the object in the Command Window, but it allows callback functions to access it.

If the object is not listed in the Children property of the component's parent object, then functions that get object handles by searching the object hierarchy or querying handle properties cannot return it. This includes get, findobj, gca, gcf, gco, newplot, cla, clf, and close.

Hidden object handles are still valid. Set the root ShowHiddenHandles property to 'on' to list all object handles, regardless of their HandleVisibility property setting.

Attributes:

GetAccess
public
SetAccess
public
Dependent
true
GetObservable
true
SetObservable
true
Identifiers

Type of UI component object, returned as character vector containing the component name.

Attributes:

GetAccess
public
SetAccess
protected
NonCopyable
true
Transient
true

Object identifier, specified as a character vector or string scalar. You can specify a unique Tag value to serve as an identifier for an object. When you need access to the object elsewhere in your code, you can use the findobj function to search for the object based on the Tag value.

Attributes:

GetAccess
public
SetAccess
public
Dependent
true
GetObservable
true
SetObservable
true

User data, specified as any MATLAB array. For example, you can specify a scalar, vector, matrix, cell array, character array, table, or structure. Use this property to store arbitrary data on an object.

If you are working in App Designer, create public or private properties in the app to share data instead of using the UserData property. For more information, see Share Data Within App Designer Apps.

Attributes:

GetAccess
public
SetAccess
public
Transient
true
GetObservable
true
SetObservable
true

Methods

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Examples

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Define a class called IPAddressComponent that creates a custom component for inputting four values to form an IP address.

To define the class, create a file called IPAddressComponent.m that contains the following class definition with these features:

  • A Value public property that stores the IP address.

  • NumericField and GridLayout private properties that place four numeric edit fields in a horizontal row.

  • A setup method that initializes NumericField and GridLayout.

  • An update method that updates the NumericField values when the IP address changes.

  • A handleNewValue method that sets the Value property based on the values of the 4 numeric edit fields.

classdef IPAddressComponent < matlab.ui.componentcontainer.ComponentContainer
    % IPAddressComponent a set of 4 edit fields for IP Address input
    properties
        Value (1,4) {mustBeNonnegative, mustBeInteger, mustBeLessThanOrEqual(Value, 255)} = [192 168 1 2];
    end
    
    events (HasCallbackProperty, NotifyAccess = protected)
        ValueChanged % ValueChangedFcn callback property will be generated
    end

    
    properties (Access = private, Transient, NonCopyable)
        NumericField (1,4) matlab.ui.control.NumericEditField
        GridLayout matlab.ui.container.GridLayout
    end
    
    methods (Access=protected)
        function setup(obj)
            % Set the initial position of this component
            obj.Position = [100 100 150 22];
            
            % Layout
            obj.GridLayout = uigridlayout(obj,[1,5], ...
                'RowHeight',{22},'ColumnWidth',{30,30,30,30,22},...
                'Padding',0,'ColumnSpacing',2);
            
            % Building blocks
            for k = 1:4
                obj.NumericField(k) = uieditfield(obj.GridLayout, 'numeric',...
                    'Limits', [0 255], 'RoundFractionalValues', true, ...
                    'FontName', 'Courier New', 'FontWeight', 'bold', ...
                    'ValueChangedFcn',@(o,e) obj.handleNewValue());
            end
          
        end
        
        function update(obj)
            % Update view
            for k = 1:4
                obj.NumericField(k).Value = obj.Value(k);
            end
        end
    end
       
    methods (Access=private)
        function handleNewValue(obj)
            obj.Value = [obj.NumericField.Value];  
            
            % Execute the event listeners and the ValueChangedFcn callback property
            notify(obj,'ValueChanged');
        end
    end
end

Next, create the component by calling the IPAddressComponent constructor method, which is provided by the ComponentContainer class, and return the object as h. Specify a function that displays the new IP address in the Command Window when the component value changes.

 h = IPAddressComponent;
 h.ValueChangedFcn = @(o,e) disp(['Value changed to: ', num2str(h.Value)]);

Enter the IP Address 192.168.1.10 into the edit fields. MATLAB displays the updated IP address in the Command Window.

More About

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Introduced in R2020b